Help me  please, Whats the difference in thousands on a std. no go gauge  for 30-06 to a field guage no go. Thanks

I believe the answer to your specific request about the 30-06 is that the No-Go is 0.005" longer than the Go and the Field is 0.005" longer than the No-Go. 1.940", 1.945" and 1.950" as I recall but you might check Hatcher's Notebook to be sure. I believe these are US Army dimensions and may bear little or no resemblance to SAAMI specs. I do recall that the Min-Max headspace difference does vary by cartridge, that is, some may use a 0.005" differential dimension while others may use 0.004" or similar. Also the headspace on belted magnums can be a nightrmare due to varying dimensions, you gotta match your gauges with each other and also with your brass.
Good luck, Joe